A stratovolcano, also known as a composite volcano, is a conical volcano built up by many layers (strata) of hardened lava, tephra, pumice, and volcanic ash.nlike shield volcanoes, stratovolcanoes are characterized by a steep profile and periodic explosive eruptions and effusive eruptions, although some have collapsed craters called calderas. The lava flowing from stratovolcanoes typically cools and hardens before spreading far due to high viscosity.
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Secondary waves are also called. S waves. As they pass through a material, the materialâs particles are. shaken up and down or from side to side. Secondary waves rock small. buildings back and forth as they pass. Secondary waves can travel through rock, but unlike primary waves. they cannot travel through liquids or gases. Look at the illustrations on. page 231. As a primary wave passes through a material, the volume and. density of the material change slightly.